Parameterised ADOCommand object Vs Exec SQL

Hi
Is it harmful to use "Exec <sp_name>(<param1>,<param2> .. )"  as an SQL and
execute it through
ADORecordset object rather than through parameterised ADOCommand object?
We are using the first approach due to some application-specific reasons.To
change to the second approach will take a lot of effort.Is it really
worthwhile?
Regs
Chaitu